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My guess (and this is a shot in the dark) would be that there are sections of the Tories' traditional base who are offended by Johnson's uncouthness/brazen 'sleaze' (for want of a better word).
Either that or there are people who think that the Tories' rhetorical promise of various regional investment programmes, plus their spending throughout covid, constitute some sort of socialist betrayal of true conservatism
Not really appropriate for the Starmer thread but I have heard a bit of the sentiment "I wish there was an actual conservative party to vote for" recently. I suspect it's a big group, some of them are currently voting anyone but Tory, but possibly more are just voting big C conservative - so another option would split that vote.